The Voyage of the Beagle (Ch. III), by Charles Darwin

<p>A very definite etiquette is followed by a stranger on the vast plains of South America. "Ave Maria" is the common salutation. If the stranger is on horseback, he does not alight until invited to do so by his host. Once in the house, the stranger must converse a while before asking shelter for the night. (Volume 29, Harvard Classics)</p>